Answer: (C) Unicast
Explanation:
According to the question, if we sending an email to someone individually then, uni-cast addressing type is used. The unit addressing is basically used to represent the single local area network interface.
The unit-cast frame sent only to the specific devices not to the group of the devices. The unitcast basically use between the one source to the one destination.
On the other hand, multicast and broadcast are incorrect because the frame sent to the group of the devices not the specific devices. Therefore, Option (C) is correct.
